《Table 4 Differences of the mean and maximum values for combinations of length indices at stations i

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《Variations of the thermal growing season during the period 1961–2015 in northern China》

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For the six indices of the length of the growing season，LI 4（>5d>5°C Fr|10d<5°C）had the shortest length，and LI 1（=5d>5°C|=5d<5°C）had the longest length of the growing season，with the difference of 12.0 days for the mean values（Table 4）.Meanwhile，LI 1 had a longer growing season of 9.3 days than LI 3（=5d>5°C Fr|10d<5°C），and LI 2（>5d>5°C|>5d<5°C）had a longer growing season of 10.5 days than LI 4 over the past 55 years.The difference for the pair of LI 1 vs.LI 2 was the least（1.4 days）.Two indices，including the frost criteria，LI 5（=5d>5°C Fr|Fr or=5d<5°C）and LI 6（>5d>5°C Fr|Fr or>5d<5°C），had shorter length of the growing season than those not including the frost criteria（LI 1 and LI 2），with the differences of 3.1 and 3.2 days，respectively（Fig.3）.Once again it showed that including the frost criterion or not could cause smaller differences of the mean values than those from the different lengths of the spells in the definition of the length of the growing season.